DE102004044825A1 - Monitoring method for sealing of exhaust gas of internal combustion engine involves using sensor, which detects specific parameters of reducing agent and in case of deviation initiation of signal takes place - Google Patents
Monitoring method for sealing of exhaust gas of internal combustion engine involves using sensor, which detects specific parameters of reducing agent and in case of deviation initiation of signal takes place Download PDFInfo
- Publication number
- DE102004044825A1 DE102004044825A1 DE102004044825A DE102004044825A DE102004044825A1 DE 102004044825 A1 DE102004044825 A1 DE 102004044825A1 DE 102004044825 A DE102004044825 A DE 102004044825A DE 102004044825 A DE102004044825 A DE 102004044825A DE 102004044825 A1 DE102004044825 A1 DE 102004044825A1
- Authority
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- Germany
- Prior art keywords
- reducing agent
- sensor
- internal combustion
- exhaust gas
- characteristic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1808—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1811—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Überwachung eines Abgasnachbehandlungssystems für die Abgase von Brennkraftmaschinen, bei dem zur Abgasnachbehandlung in das Abgas vor einem Katalysator ein Reduktionsmittel, z. B. in der Form einer wässrigen Harnstofflösung, eindosiert wird und das Reduktionsmittel in einem Reduktionsmitteltank gespeichert wird. Weiterhin betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The The invention relates to a method for monitoring an exhaust aftertreatment system for the exhaust gases of internal combustion engines, wherein the exhaust aftertreatment in the Exhaust gas before a catalyst, a reducing agent, for. B. in the form an aqueous Urea solution, is metered in and the reducing agent in a reducing agent tank is stored. Furthermore, the invention relates to a device to carry out of the procedure.
Zur
Einhaltung der NOx-Grenzwerte EURO IV und
EURO V für
Nutzfahrzeuge in Europa werden die Motorenhersteller überwiegend
das Abgasnachbehandlungsverfahren SCR (Selective Catalytic Reduction) einsetzen.
Bei diesem Verfahren wird zur Reduktion der Stickoxide eine wässrige Harnstofflösung vor
dem Katalysator in das Abgas eindosiert. Die Qualität der wässrigen
Harnstofflösung
wird in DIN V70070:2002 beschrieben. Die wichtigsten limitierten
Parameter sind:
In der Emissionsgesetzgebung 1999/96/EG ist zur Einhaltung der Emissionsgrenzwerte im Praxisbetrieb die On-Board-Diagnose (OBD) vorgesehen, detaillierte gesetzliche Regelungen zur OBD stehen aber noch aus. Ein wichtiger Punkt einer OBD für Motoren mit SCR wird darin bestehen, ob der Anwender auch regelmäßig den Reduktionsmitteltank mit Reduktionsmittel füllt (Füllstandsüberwachung) und ob er auch das korrekte Reduktionsmittel tankt (Qualitäts-Überwachung).In Emission legislation 1999/96 / EC is to comply with the emission limit values In practice, the on-board diagnostic (OBD) provided, detailed statutory regulations on OBD are still pending. An important Point of an OBD for Motors with SCR will consist in whether the user also regularly the Reducing agent tank with reducing agent fills (level monitoring) and whether he too the correct reducing agent fuels (quality monitoring).
In
der
Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren und eine Vorrichtung zur Überwachung eines Abgasnachbehandlungssystems anzugeben, mit dem eine einfache und sichere Qualitäts-Überwachung des Reduktionsmittels durchführbar ist.Of the The invention is based on the object, a method and a device for monitoring specify an exhaust aftertreatment system, with a simple and secure quality monitoring of the reducing agent feasible is.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale der unabhängigen Ansprüche gelöst.According to the invention this Problem solved by the features of the independent claims.
Dadurch, dass zumindest ein Sensor eine spezifische Kenngröße des Reduktionsmittels aus dem Reduktionsmitteltank detektiert und in einem Steuergerät diese spezifische Kenngröße mit einer vorgegebenen Kenngröße verglichen wird und bei Abweichung der spezifischen Kenngröße von der vorgegebenen Kenngröße ein Vorgang, z. B. ein Signal, initiiert wird, ist eine einfache und sichere Überwachung des Reduktionsmittels geschaffen.Thereby, that at least one sensor has a specific characteristic of the reducing agent detected from the reducing agent tank and in a control unit this specific characteristic with a predetermined characteristic compared and if the specific parameter deviates from the predefined parameter, a process z. As a signal is initiated, is a simple and secure monitoring created the reducing agent.
Eine Ausbildung des erfindungsgemäßen Verfahrens zeichnet sich dadurch aus, dass der Sensor ein Drucksensor ist und im Reduktionsmitteltank zwei Drucksensoren in einem voneinander verschiedenen vertikalen Abstand angeordnet werden und die detektierte Druckdifferenz dieser beiden Drucksensoren als spezifische Kenngröße mit der Dichte des Reduktionsmittels als vorgegebene Kenngröße vergli chen wird. Alternativ ist der Sensor als Druckdifferenzsensor ausgebildet.A Formation of the method according to the invention is characterized by the fact that the sensor is a pressure sensor and in the reducing agent tank, two pressure sensors in one another different vertical distance can be arranged and the detected Pressure difference of these two pressure sensors as a specific characteristic with the Density of the reducing agent as a predetermined characteristic vergli chen becomes. Alternatively, the sensor is designed as a pressure difference sensor.
Im Reduktionsmitteltank werden also erfindungsgemäß zwei Drucksensoren angebracht, die den Druck messen, den die über den Drucksensoren stehende Flüssigkeitssäule ausübt. Ein Drucksensor wird hierbei am Boden des Reduktionsmitteltanks angeordnet und ein anderer Drucksensor in einem vertikal höheren Bereich. Die Differenz der beiden Drucksignale ist bei der konstanten Höhendifferenz der Drucksensoren der Dichte des Reduktionsmittels proportional.in the Reducing agent tank so two pressure sensors are mounted according to the invention, that measure the pressure the over the fluid pressure column standing column. One Pressure sensor is arranged at the bottom of the reducing agent tank and another pressure sensor in a vertically higher range. The difference the two pressure signals is at the constant height difference of the pressure sensors of the Density of the reducing agent proportional.
Sind z. B. die beiden Drucksensoren in einem Höhenabstand von 30 cm angeordnet, ist die Druckdifferenz bei Betankung mit Wasser 3.00 kPa. Bei einem vorgeschriebenen Dichtebereich der Harnstofflösung von 1,08 bis 1,10 g/cm3 beträgt die Druckdifferenz 3,24 bis 3,30 kPa. Somit sind Befüllungen des Reduktionsmitteltanks mit Harnstofflösung und mit Wasser sicher unterscheidbar.Are z. B. the two pressure sensors arranged at a height distance of 30 cm, the pressure difference when refueling with water is 3.00 kPa. With a prescribed density range of the urea solution of 1.08 to 1.10 g / cm 3 , the pressure difference is 3.24 to 3.30 kPa. Thus, fillings are the reduction Medium tanks with urea solution and with water safely distinguishable.
Die exakte Bestimmung der Druckdifferenz könnte während des Fahrbetriebs wegen der Bewegung der Flüssigkeit zu Schwierigkeiten führen. Aus diesem Grund kann erfindungsgemäß als Druckdifferenz eine Mittelung mehrerer Messungen im zeitlichen Abstand voneinander herangezogen werden. Alternativ kann die Messung der Druckdifferenz nach dem Abstellen der Brennkraftmaschine oder nach dem Betanken des Reduktionsmittels erfolgen.The exact determination of the pressure difference could occur during driving the movement of the liquid lead to difficulties. For this reason, according to the invention, averaging can be used as the pressure difference several measurements at a time interval from each other become. Alternatively, the measurement of the pressure difference after the Turning off the engine or after refueling the reducing agent respectively.
Wegen der Temperaturabhängigkeit der Dichte sollte bevorzugt zusätzlich zu den Druckmessungen eine Temperaturmessung des Reduktionsmittels im Reduktionsmitteltank durchgeführt werden und die spezifische und/oder die vorgegebene Kenngröße entsprechend der detektierten Temperatur korrigiert werden.Because of the temperature dependence The density should be preferred in addition to the pressure measurements, a temperature measurement of the reducing agent carried out in the reducing agent tank be and the specific and / or the predetermined characteristic accordingly the detected temperature can be corrected.
Bei Schieflagen des Fahrzeugs ergeben sich verminderte Druckdifferenzen und daraus errechnete Harnstoffgehalte. Bei einer Schieflage von 10% ergibt sich ein Minderbefund von 2 Gewichts-% und bei 20 % Schieflage ein Minderbefund von nur 8 Gewichts-%. Somit ist auch bei 20 % Schieflage die Harnstofflösung noch sicher von Wasser unterscheidbar. Auch gleichen sich die Schieflage-Effekte über längere Betriebszeiten aus.at Imbalances of the vehicle result in reduced pressure differences and calculated urea contents. In an imbalance of 10% results in a reduction of 2% by weight and 20% imbalance a reduction of only 8% by weight. Thus, even at 20% imbalance the urea solution still distinct from water. Also, the imbalance effects compensate for longer operating times.
Da zur Bestimmung der Reduktionsmittelqualität zwei Drucksensoren erforderlich sind, kann diese Bestimmung nur bei einem Füllstand erfolgen, bei dem auch der obere Drucksensor noch in die Flüssigkeit eingetaucht ist. Bezüglich der Positionswahl des oberen Drucksensors muss eine Optimierung zwischen der zeitlichen Verfügbarkeit (tiefe Position optimal) und der Messgenauigkeit (hohe Position optimal) erfolgen.There to determine the reducing agent quality two pressure sensors required , this determination can be made only at a level, in which also the upper pressure sensor is still immersed in the liquid. Regarding the Position selection of the upper pressure sensor must be an optimization between the temporal availability (low position optimal) and the measuring accuracy (high position optimal).
Außerdem kann der Absolutwert eines, sinnvollerweise des unteren, Drucksensors zur Füllstandsanzeige verwendet werden.In addition, can the absolute value of one, meaningfully the lower, pressure sensor to the level indicator be used.
Ein alternatives Verfahren zeichnet sich dadurch aus, dass der Sensor ein optischer Sensor zur Bestimmung der Brechzahl ist und die detektierte Brechzahl als spezifische Kenngröße mit der Brechzahl des Reduktionsmittels als vorgegebene Kenngröße verglichen wird. Die Brechzahl der wässrigen Harnstofflösung liegt zwischen 1,381 und 1,385. Dies unterscheidet sich ausreichend genug von der Brechzahl des Wassers von 1,00, d. h. auch mit optischen Sensoren, welche die Brechzahl des Reduktionsmittels messen, ist eine Qualitäts-Überwachung des Reduktionsmittels einfach und sicher durchführbar.One alternative method is characterized in that the sensor is an optical sensor for determining the refractive index and the detected Refractive index as a specific characteristic with the Refractive index of the reducing agent compared as a predetermined characteristic becomes. The refractive index of the aqueous Urea solution is located between 1.381 and 1.385. This is sufficiently different from the refractive index of the water of 1.00, d. H. also with optical Sensors which measure the refractive index of the reducing agent is a quality monitoring of the reducing agent simple and safe to carry out.
Eine erfindungsgemäße Vorrichtung zur Überwachung eines Abgasnachbehandlungssystems für die Abgase von Brennkraftmaschinen mit einem Reduktionsmitteltank zur Aufnahme eines Reduktionsmit tels, welches zur Abgasnachbehandlung in das Abgas vor einem Katalysator eindosierbar ist, zeichnet sich dadurch aus, dass im Reduktionsmitteltank zumindest ein Sensor angeordnet ist, der eine spezifische Kenngröße des Reduktionsmittels detektiert und in einem Steuergerät diese spezifische Kenngröße mit einer vorgegebenen Kenngröße verglichen wird und bei Abweichung der spezifischen Kenngröße von der vorgegebenen Kenngröße ein Vorgang, z. B. ein Signal initiiert wird.A inventive device for monitoring an exhaust aftertreatment system for the exhaust gases of internal combustion engines with a reducing agent tank for receiving a reducing agent, which for exhaust aftertreatment in the exhaust gas before a catalyst is metered, characterized in that in the reducing agent tank at least one sensor is arranged, which has a specific characteristic of the reducing agent detected and in a control unit this specific characteristic with a predetermined characteristic compared and if the specific parameter deviates from the predefined parameter, a process z. B. a signal is initiated.
Das beschriebene Verfahren oder die beschriebene Vorrichtung zeichnen sich bevorzugt dadurch aus, dass die Brennkraftmaschine eine selbstzündende Brennkraftmaschine ist.The described method or apparatus described draw It is preferable in that the internal combustion engine is a self-igniting internal combustion engine is.
Wenn in der Beschreibung der Erfindung davon gesprochen wird, dass die Sensoren im Reduktionsmitteltank angeordnet sind, so ist damit auch eine Anordnung verstanden, bei der die Sensoren in einem getrennten Behältnis angeordnet sind, welches mit dem Reduktionsmitteltank über einen Schlauch oder allgemein einer Leitung verbunden ist. Das getrennte Behältnis ist dabei vertikal unterhalb des Reduktionsmitteltanks angeordnet und kann z. B. auch ein schmales Rohr ausreichender vertikaler Höhe sein. Dadurch, dass dieses Behältnis vertikal unterhalb des Reduktionsmitteltanks angeordnet ist, kann es an einem beliebigen Ort angebracht werden, wo eine ausreichende Höhe verfügbar ist. Das Reduktionsmittel kann auch bevorzugt an der tiefsten Stelle des Behältnisses abgeführt werden.If in the description of the invention it is said that the Sensors are arranged in the reducing agent tank, so is it too an arrangement understood in which the sensors in a separate container are arranged, which with the reducing agent tank via a Hose or generally connected to a line. The disconnected container is arranged vertically below the reducing agent tank and can z. B. also be a narrow tube sufficient vertical height. Because of this container vertically disposed below the reducing agent tank can It can be affixed to any place where adequate Height is available. The reducing agent may also preferably be at the lowest point of the container dissipated become.
Weitere Merkmale der Erfindung ergeben sich aus den Figuren, die nachfolgend beschrieben sind.Further Features of the invention will become apparent from the figures below are described.
Dieses
Reduktionsmittel
Zur Überwachung
des Abgasnachbehandlungssystems, d. h. zur Überprüfung, ob sich auch das zugelassene
Reduktionsmittel
Bei
Abweichung der spezifischen Kenngröße von der vorgegebenen Kenngröße wird
ein Vorgang, z. B. ein Signal vom Steuergerät
Die
Aufbereitung und Behandlung der von den Drucksensoren
In
besonderer Ausgestaltung der Erfindung wird als Druckdifferenz eine
Mittelung mehrerer Messungen im zeitlichen Abstand voneinander herangezogen
oder die Messung der Druckdifferenz erfolgt nach dem Abstellen der
Brennkraftmaschine oder nach dem Betanken des Reduktionsmittels
In
bevorzugter Ausgestaltung erfolgt zusätzlich zu den Druckmessungen
eine Temperaturmessung des Reduktionsmittels
Der
Absolutwert eines Drucksensors
In
alternativer erfindungsgemäßer Ausgestaltung
ist im Reduktionsmitteltank
In
der
- 11
- Reduktionsmittelreducing agent
- 22
- ReduktionsmitteltankReductant tank
- 33
- Drucksensorpressure sensor
- 44
- Drucksensorpressure sensor
- 55
- Optischer Sensoroptical sensor
- 66
- Vertikaler Abstandvertical distance
- 77
- Steuergerätcontrol unit
- 88th
- Einfüllstutzenfiller pipe
- 99
- SignalverarbeitungseinheitSignal processing unit
- 1010
- Temperatursensortemperature sensor
- 1111
- Schlauchtube
- 1212
- Rohrpipe
- 1313
- Abflussoutflow
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004044825A DE102004044825A1 (en) | 2004-09-16 | 2004-09-16 | Monitoring method for sealing of exhaust gas of internal combustion engine involves using sensor, which detects specific parameters of reducing agent and in case of deviation initiation of signal takes place |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004044825A DE102004044825A1 (en) | 2004-09-16 | 2004-09-16 | Monitoring method for sealing of exhaust gas of internal combustion engine involves using sensor, which detects specific parameters of reducing agent and in case of deviation initiation of signal takes place |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004044825A1 true DE102004044825A1 (en) | 2006-03-23 |
Family
ID=36001602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102004044825A Ceased DE102004044825A1 (en) | 2004-09-16 | 2004-09-16 | Monitoring method for sealing of exhaust gas of internal combustion engine involves using sensor, which detects specific parameters of reducing agent and in case of deviation initiation of signal takes place |
Country Status (1)
Country | Link |
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DE (1) | DE102004044825A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006033476A1 (en) * | 2006-07-19 | 2008-01-31 | Siemens Ag | Exhaust-gas after treatment system i.e. nitrogen oxide contained internal combustion engine, monitoring method, involves detecting error of reducing agent in case of deviation of measured nitrogen oxide conversion of stored value |
FR2909901A1 (en) * | 2006-12-14 | 2008-06-20 | Inergy Automotive Systems Res | Metering of aqueous ammonia precursor solution into exhaust gases of internal combustion engine involves determining total amount of ammonia in solution, and calculating volume of solution to-be-injected for determined amount |
EP2067517A2 (en) * | 2007-12-04 | 2009-06-10 | Caterpillar Inc. | Systems and methods for monitoring the quality of a reducing agent |
DE102008044335A1 (en) | 2008-12-04 | 2010-06-10 | Robert Bosch Gmbh | Method for determining filling level of aqueous urea solution in reducing agent tank of nitrogen oxide- reduction system of internal combustion engine of vehicle, involves obtaining level from temporal progression of temperature curve |
US8850797B2 (en) | 2006-06-08 | 2014-10-07 | Inergy Automotive Systems Research S.A. | Engine exhaust gas additive storage system |
DE102013112824A1 (en) * | 2013-11-20 | 2015-05-21 | Elobau Gmbh & Co. Kg | withdrawal unit |
CN109763882A (en) * | 2018-10-02 | 2019-05-17 | 湖北迪耐斯通达排放处理系统有限公司 | A kind of urea tank diagnostic system |
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WO2000021881A1 (en) * | 1998-10-13 | 2000-04-20 | Clean Diesel Technologies, Inc. | REDUCING NOx EMISSIONS FROM AN ENGINE BY TEMPERATURE-CONTROLLED UREA INJECTION FOR SELECTIVE CATALYTIC REDUCTION |
EP1283332A2 (en) * | 2001-08-09 | 2003-02-12 | Robert Bosch Gmbh | Exhaust treatment unit and measuring device for determining the concentration of a urea and water solution |
DE10324009A1 (en) * | 2002-12-17 | 2004-07-08 | Robert Bosch Gmbh | Differential pressure sensor for measuring the height of the liquid in a tank, in particular the urea tank of a urea metering system |
-
2004
- 2004-09-16 DE DE102004044825A patent/DE102004044825A1/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000021881A1 (en) * | 1998-10-13 | 2000-04-20 | Clean Diesel Technologies, Inc. | REDUCING NOx EMISSIONS FROM AN ENGINE BY TEMPERATURE-CONTROLLED UREA INJECTION FOR SELECTIVE CATALYTIC REDUCTION |
EP1283332A2 (en) * | 2001-08-09 | 2003-02-12 | Robert Bosch Gmbh | Exhaust treatment unit and measuring device for determining the concentration of a urea and water solution |
DE10324009A1 (en) * | 2002-12-17 | 2004-07-08 | Robert Bosch Gmbh | Differential pressure sensor for measuring the height of the liquid in a tank, in particular the urea tank of a urea metering system |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US8850797B2 (en) | 2006-06-08 | 2014-10-07 | Inergy Automotive Systems Research S.A. | Engine exhaust gas additive storage system |
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DE102013112824A1 (en) * | 2013-11-20 | 2015-05-21 | Elobau Gmbh & Co. Kg | withdrawal unit |
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